Draft-regulating device for chain grates.



A. L. F. LEFEVRE.

DRAFT BEGULATING DEVICE FOR CHAIN GRATES.

APPLICATION FILED NOV. 5. I915: 1,21 3,661., Patented. Jan. 23, 1917.

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A. L. F. LEFEVR E. DRAFT REGULATING DEViCE FOR CHAIN GRATES.

APPUCATION FILED NOV. 5. I915- 1 13,61, Patented Jan. 23, 1917.

2 SHEETS-SHEET 2- ETD SEA L DRAFT-REGULATING DEVICE FOR CHAIN GRATES.

Specification of Letters Patent.

Patented J an. 23, 1917.

Application filed November 5, 1915. Serial No. 59,803. I

I '0 all whom it may concern:

Be it known that I, ARMAND LEON FRED- nnro Lnrievnn, a citizen of the Republic of I France, residing at 5 Rue du Jambon, St.-

Denis, Seine, France, have invented new and useful Improvements in Draft-Regulating Devices for Chain Grates, of which the following is a specification.

The present invention relates to a draftregulating device intended for mechanical grates in the form of a continuous chain, consisting of grate-bars, carried by supports which are provided with dampers.

The draft-regulating device according to this invention is constructed in such a manner as to insure that, when the actuating and controlling members for the dampers are in the position corresponding to the maximum opening, all the dampers are wide open, whereas previous systems hitherto used are subject to the drawback that, with the said controlling members in this same position, certain of the dampers are always partially closed.

The accompanying drawing shows one form of the invention, given merely as an example and in no way limitative.

Figure 1 is a purely schematic diagram intended to facilitate the explanation of the drawback mentioned above, to which previous systems were subject and which it is the object of the present invention to 0bviate. Fig. 2 is a central, longitudinal vertical section of Fig. 3, showing a regulating device constructed according to the invention, for mechanical grates of the kind in question. Fig. 3 is a plan View, partly broken away in order to save space. Fig. 4 shows a detail on a larger scale in crosssection along the line 4.4 of Fig. 2,

In mechanical grates forming a continuous chain of the kind mentioned above, the closure of the dampers was obtained, up to the present, more or less rapidly, by means of a kind of slide-way such as is shown at d in Figs. 2 to l of the accompanying drawing and represented diagrammatically in Fig. 1. This slide-way was formed in two parts, arranged end to end and suitably guided at the opposite ends of the slide at a and 0. These two parts were hinged together at their confronting ends, so as to be capable of movement between the positions 7) and b (Fig. 1) and vice-versa; such lateral movements having for their object the.

more or less premature opening or closing of the dampers actuated by the slide-way, each of the points a and 0 remaining constantly at a fixed distance from the dotted line m-y (Fig. 1) which indicates diagrammatically the longitudinal axis or median line of the grate. If it is admitted that, for all. points of the laterally movable slide-way which are at the same distance from the line w-y as the point 0, the corresponding dampers are completely closed, while, for all the points of this slide which are situate at the same distance from the said line wy as the point a, the corresponding dampers are wide open, it will be easily understood that the systems under consideration were subject to the drawback that, even for the position b of the point 6 which corresponded to the maximum opening (the line (1-6 being parallel to the line my), the dampers actuated on the slide between the points 0 and I) remained partially closed. The device shown in Figs. 2 to 4 of the drawing obviates this drawback. It is constructed as follows :The slide-way, to which are connected at various points the various dampers to be actuated thereby (the position of two dampers only being shown at e, e in Fig. 3), is formed, as in the previous arrangements, in two portions (ab and Z)-0, Fig. 3) placed end to end and hinged together at (5. Two slide-ways cl are arranged, one on each side of the longitudinal axis or median line of the grate and derive their movement from the same transverse driving shaft f, to which an oscillatory movement can be imparted from the exterior of the boiler by means of the lever f (Fig. 2) which is coupled by means of the connecting rod f to a lever f keyed on the said shaft. The arrangement of the slidewaysand of their actuating organs being symmetrical on both sides of thegrate, it will be suflicient here to describe the device on one side only.

On the transverse shaft 7 is keyed a lever 9 (Fig. 2) which, by means of a cap it forming a pivot, is connected to a cam h rigidly connected in its turn by a link 2' to another cam 72. which is similar, but is arranged the opposite way around. The two cams h and k are guided in fixed guides j in such a manner as to be compelled to perform a rectilinear movement parallel to the axis or median line of the grate under the action of the oscillatory movements imparted to the shaft 7'. WVithin the slots of the cams h, if, there engage two rolls 7a, 72 one of which is fixed to the hinge cl of the two parts of the slide-Way (Z of the regulator for the dampers, while the other is fixed t0 the other extremity 0 of one of the portions (bc) of this slideway. In the arrangement here shown, the other end a of the other portion (a-Z of the slide-way (Z is ccmpelled by a guide to remain constantly at a fixed distance from the aforesaid median line. By reason of their angular configuration (Fig. 3),' which presents a portion parallel to the median line and a portion inclined relative to this line, the

r slots of the cams h, 7& determine the lateral position of the rolls 7c, 70 and oblige them to move in the fixed guide-forks Z which are disposed transversely of the grate.

In the position shown in the drawing, all the dampers actuated by the portion ab of the regulating slide-way d (a portion which is in this position parallel to the me dian line and of which all the points are consequently at the same distance from this latter as the point a) are, as shown in the case of damper e in Fig. 3, fully open, while the dampers connected to the portion 5-0 of the slide-way are progressively closed from the point 6 up to the point 0, at which latter point the dampers are completely closed, as shown in the case of damper e in Fig. 3.

If, by suitably operating the lever f (Fig. 2), the cams h, k are pushed into their extreme position toward the right (in Figs. 2 and 3), the dampers will still remain open at 7) (like the damper c in Fig. 3) and will also open from Z) to 0, since, owing to the action of the inclined portion of the slot of the cam 15 on the roll 7%, the point 0 will approach the median line and will place itself on the prolongation of the straight line joining the points a and b. If, by moving the lever f in an opposite direction, the cams 71-, k are brought into their extreme position toward the left, the roll 70 under the action of the inclined portion of the slot of the cam it, moves outwardly away from the median line, taking up a position such that the straight line oining it to the point 0 would be parallel to the said median line. It is evident that under these circumstances the dampers would be completely closed from b to c, as is the damper c, Fig. 3, while closing would be progressive from a to b.

For all intermediate positions, the cams h, b will modify the opening of the dampers at the points 6 and 0, but not both at once; one of the cams only begins to act after the other has completely effected its opening or closing action.

It is evident that the extremity a of the regulating slide-way could also be provided, like the points I) and c, with a cam similar to cams h and b and also actuated by the I claim: I

l. A draft-regulating device for chaingra-tes, comprising slideways, each slideway being in two parts hinged together, dampers moving with the grate and controlled by said slide-ways, a roll fixed to the point of connection of the two parts of each slideway, a cam having a slot receiving said roll, said cam-slot having a straight portion and an outwardly inclined portion, a roll fixed to the other extremity of one portion of the slideway, a cam having a slot receiving the last-named roll, the last-named cam-slot having a straight portion, and an inwardly inclined portion and means for moving said cams to actuate the slide-ways.

2. A draft-regulating device for chaingrates comprising a slide-way on each side of the 'rate, each slide-way being in two parts hinged together, dampers moving with the grate and controlled by said slideways, a roll fixed to the point of connection of the two parts of each slideway, a cam having a slot receiving said roll, said slot having a straight portion and an outwardly inclined portion, a roll fixed to the other extremity of one slide-way portion, a cam having a slot receiving the last-named roll, the last-named slot having an inwardly inclined portion and a straight portion, the outwardly and inwardly inclined portions of said slots being adjacent to each other or between the straight portions, a guide for said cams, parallel to the longitudinal axis or median line of the grate, and means for moving said cams to actuate the slide-ways.

3. A draft-regulating device for chaingrates, comprising a slide-way on each side of the grate, each slide-way being in two parts hinged together, dampers moving with the grate and controlled by said slideways, a roll fixed to the point of connection of the two parts of each slideway, a cam having a slot receiving said roll, said slot having a straight portion and an outwardly inclined portion, a roll fixed to the other extremity of one slide-way portion, a cam having a slot receiving the last-named roll,

the last-named slot having an inwardly inclined portion and a straight portion, the second cam-slot being similar in form but arranged in the reverse direction to the first cam-slot, a guide for said cams parallel to the longitudinal axis or median line of the grate, connecting means between said cams and means for actuating said connecting means.

at. A draft-regulating device for chaingrates, comprising a pair of slide-ways arranged at opposite sides of the grate, each slide-way composed of a pair of sections disposed end to end and having their confronting inner ends hinged together; dampers moving with the grate and controlled by said slide-ways; a pair of adjusting devices located at the points of connection of said slide-ways, and connected together for movement in unison; a second adjusting device located at the outer end of one section of each slide-way; a motion-transmitting connection between the two adjusting devices of each section; and means for operating the first-named adjusting devices, to shift said slide-ways relatively to the longitudinal axis or median line of the grate.

5. A draft-regulating device for chaingrates, comprising a pair of slide-ways arranged at opposite sides of the grate, each slide-way composed of a pair of sections disposed end to end and having their confronting inner ends hinged together; dampers moving with the grate and controlled by said slide-ways; a pair of rolls connected to the hinge-joints of said slide-ways; a pair of cams co-acting with said rolls, and connected together for movement in unison; a roll connected to the outer end of one section of each slide-way; a cam co-acting with each second-named roll and connected with the corresponding first-named cam to move in unison therewith; and means for operating said first-named cams, to shift said slideways relatively to the longitudinal axis or median line of the grate.

6. A draft-regulating device for chaingrates, comprising a pair of slide-Ways arranged at opposite sides of the grate, each slide-way composed of a pair of sections disposed end to end and having their confronting inner ends hinged together; dampers moving with the grate and controlled by said slide-.vays; a pair of adjusting devices located at the points of connection of said slide ways; a transverselydisposed rockshaft connected with said adjusting devices, to operate them in unison; a second adjusting device located at the outer end Or one section of each slide-way; a motion-transmitting connection between the two adjusting devices of each slide-wa and means for rocking said shaft, to actuate all four adjusting devices concurrently and thereby shift said slide-ways relatively to the longitudinal axis or median line of the grate.

7. A draft-regulating device for chaingrates, comprising a pair of slide-ways arranged at opposite sides of the grate, each slide-way composed of a pair of sections disposed end to end and having their confronting inner ends hinged together; dampers moving with the grate and controlled by said slideways; a pair of rolls connected to the hinge-joints of said slide-ways; a pair of cams co-acting with said rolls; a trans versely-disposed rock-shaft connected with said cams, to operate them in unison; a roll connected to the outer end of one section of each slide-way; a cam co-acting with each second-named roll and connected to the corresponding first-named cam to move in unison therewith; and means for rocking said shaft, to actuate all four cams concurrently and thereby shift said slide-ways relatively to the longitudinal axis or median line of the grate.

ARMANI) LEON FREDERIC LEFEVBE.

Witnesses:

R H. BRANDON, Louis RINUY.

Copies of this patent may be obtained for five cents each, by addressing the fiommissioner of Patents, Washington, D C. 

